Add primitive relay tests

mtglib/internal/relay/init_test.go

@@ -0,0 +1,49 @@
+package relay_test
+
+import (
+	"bytes"
+	"io"
+	"sync"
+)
+
+type loggerMock struct{}
+
+func (l loggerMock) Printf(format string, args ...interface{}) {}
+
+type rwcMock struct {
+	bytes.Buffer
+
+	closed bool
+	mutex  sync.Mutex
+}
+
+func (r *rwcMock) Read(p []byte) (int, error) {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	if r.closed {
+		return 0, io.EOF
+	}
+
+	return r.Buffer.Read(p)
+}
+
+func (r *rwcMock) Write(p []byte) (int, error) {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	if r.closed {
+		return 0, io.EOF
+	}
+
+	return r.Buffer.Write(p)
+}
+
+func (r *rwcMock) Close() error {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	r.closed = true
+
+	return nil
+}